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Calcic cores of plagioclase phenocrysts in andesite from Karymsky volcano: Evidence for rapid introduction by basaltic replenishment

¹ Alaska Volcano Observatory, Geophysical Institute, University of Alaska, Fairbanks, Alaska 99775-7320, USA
² Department of Geological Sciences, Michigan State University, East Lansing, Michigan 48824-1115, USA
³ Institute of Volcanic Geology and Geochemistry, Petropavlovsk-Kamchatsky 683006, Russia

Calcic cores in plagioclase of Karymsky andesite of the 1996–2000 eruptive cycle texturally and compositionally (both trace and major elements) mimic the plagioclase phenocrysts of basalt erupted 6 km away at the onset of the cycle. These observations support the view that simultaneous eruption of andesite and basalt at Karymsky in the beginning of the cycle represents an example of replenishment and eruption triggering of an andesitic reservoir. Homogeneity of andesitic output occurred within two months. This suggests to us that blending of injected basalt into reservoir magma was thorough and rapid.

Key Words: plagioclase • andesite • mixing • Kamchatka Peninsula

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